Radiocondenser



Aug. 24 1926. 1,597,591

F. G. FREESE RADIOCONDENSER Filed Feb. 6 1925 Patented Aug. 24, 1926. V

UNITED STATES mnx'e. FBEESE, OI ALDAN, PENNSYLVANIA.

BADIOCONDENSEB.

Application filed February 6, 1925. Serial No. 7,884.

This invention relates to condensers as designed for use in radio receiving sets, and an ob'ect of the invention is to provide a con enser having a plurality of movable plates embodied in its rotor and a plurality of stationar plates in its stator as in various approve types of condensers and in which either the plates of the rotor or stator are honeycombed or provided with a plurality of openings for reducingacapacity of the condenser and permittin more accurate adjustment thereof for t e purpose of tuning in radio stations of different wave lengths.

In the present. form of radio condensers of this type wherein the plates of both the rotor and the stator are both solid and it has been found that on certain receiving sets and dial structures only about a quarter of the graduations of the dials are accessible in tunin in the stations and by reducing the meta ic area of the plates of the condenser the tuning adjustment of the dial is increased, permitting more accurate adjustment of the plates, and consequently finer tuning in on the broadcasting stations in that it varies the distance between the aduations on the dial corresponding to the differences in the wave 1 Further objects'of the invention are that by erforating or honeycombing the lates of the condenser, the stations of di erent wave lengths are brou ht in by more gradual adjustment of t e con enser plates which enables the operator to obtain a finer and more accurate tuning of the set, also providing greater selectiveness to the set and resulting in clearer signals of relatively greater volume.

Other objects of the invention will appear in the following detail description, and in the accompanying drawings wherein:

Figure 11s a plan view of a condenser constructed in accordance with this invention. v

Figure 2-is a section through the condenser taken on the line 2-2 of Fi re 1.

Figure 3-is a view of a modi ed form of the invention showing the rotor plate solid and the stator plates perforated.

Figure 4-is a detail view of one of the rotor plates showing a modified form of perforation.

Figure 5is a view of a dial, such as used in connection with the condenser and shown in the present drawingsfor the purpose of bringin out more advantageously the o eration of the improved'condenser.

Re erring more particularly to the drawings, the improved condenser comprises the stator 1 which is composed of suitable end plates 2, carrying rods 3 and a plurality of stationary metal plates 4 which are formed of any suitable metal and are held in spaced relation one to the other by means of suitable washers 5. The condenser includes the rotor 6 embodying the central shaft 7 which is rotatably carried by the plates 2 and carries the rotor condenser plates 8 which are also formed of any suitable metal and alternate with the stator plates 4.

In the preferred form of the invention the rotor plates 8 are honeycombed or rovided with a plurality perforations 9'w ich decrease their metal area, which consequently decreases the capacity of the condenser and varies the tuning range of the condenser I HEISSUED over one in which the plates of the rotor I are solid; for example.

Referring to the dial shown in Figure 5 of the drawings, it has been found by practical demonstration or experiment that on a condenser where the plates are solid, adjustment from 200 meters to 509 meters occured on the dial from graduations 10 to 50, thereby bunching all of the broadcasting stations of intermediate wave lengths in a relatively small space on the dial and condenser which resulted in considerable difiiculty in properly tuning in stations where only a small meter difference was had between the wave lengths and frequently causing confusion of one station with another, while with the perforated or honeycombed rotor plates the tuning of the stations from 200 to 509 meters varied between the graduat'ions 10 and 85, practically doubling the adjustment necessary of the condenser to properly tune in the respective stations and consequently permitting more selective and accurate tuning of the radio receivin set.

As wi 1 be noted by reference to Figure 2 of the drawings, no two of the perforations 9 have their centers on a true radius scribed from the axis of rotation of the rotatable plates, thereby providing for gradual increasing of the metallic portion of the plate, as it is moved between the stationa plates.

In igure 3 of the drawings, a modified form of the invention is shown in which the stator plates 20 are provided with a plurality of perforations 21. These erforations 21 are shown as tangential s ots but it is to be understood that they ma be of any suitable type or shape of per oration without departing from the spirit of this invention, and in the condenser structure embodying the perforated stator plates 20 the rotor plates 22 are solid or free from perforations.

In Figure 4 of the drawings, a modified form of the perforated rotor plate is shown in which the erforations 30 are substantially V-shape with the lines of conjunction of their angled portions all positioned on an arc scribed from the axis of rotation of the plate 31. The particular arrangement of these openings permits gradual variation of the capaeit of the condenser owing to the substantially V-shape of the metallic portions of the plate between the respective slots, the metallic portion being V- shaped permits very gradual adjustment of the relative metallic portions of the movable or rotary plates.

It is, of course, to be understood, that the invention may be constructed in various other manners and the parts associated in different relations, and therefore, I do not desire to be limited in any manner, except as set forth in the claims hereunto appended.

IVhat I claim is:

1. In a variable condenser for radio receiving sets, a stator including a plurality ofstationary plates, said plates perforated with a plurality of tangential slots, said slots positioned on an arc scribed from the axis of said stator, a rotor including a plurality of semi-circular rotatable plates, said rotatable plates provided with a plurality of spaced apertures, and said a ertures positioned on a series of arcs scribed from the axis of said rotor and diminishing in diameter as they extend inwardly towards the axis of said rotor.

2. In a variable condenser for radio receiving sets, a stator including a plurality of stationary plates, said plates perforated with a plurality of tangential slots, saidslots positioned on an arc scribed from the axis of said stator, a rotor including a plurality of semi-circular rotatable plates, said rotatable plates provided with a plurality of substantially V-shaped slots with the lines of conjunction of their angled portions all positioned on an arc scribed from the axis of said rotor, and said tangential and V- shaped slot-s adapted for decreasing metallic area of the said variable condenser independently.

In testimony whereof I aflix my signature.

FRANK G. FREESE. 

